My ideas:
Super Speedway: Japan or USA - American layout; pretty much a double of Motegi SS.
Midfield: Japan - looks like the Japanese countryside.
Apricot Hill: Somewhere in Eastern Europe - apparently, that's where the apricot originated, so it could be a reference.
Red Rock Valley: Apparently, the Red Rock Canyon
is just outside Vegas, so it looks like benzoboy is right.
Smokey Mountain: Smok
ey mountain - with an 'e' - is either a rubbish dump in the Phillipines or a rock band. So either Smokey Mountain is a mistake, or PD went a bit mental. Without an 'e', it can be a mountain in California, Idaho, Tennessee, Utah or on the moon. So it's probably one of them. Apart from the last one.
Green Forest: Green forest is apparently a city in Arkansas, so it's unlikely that's how the track got it's name. It could be an alternative version of the Black Forest, Germany.
Autumn Ring: Canada. The maple leaves say it all.
Trial Mountain: Brazil or Argentina or Bolivia or somewhere around there. There's thick, dense forests, mountains, and a monkey. Then again, the Loch Ness Monster thinks differently...
Deep Forest: This is tricky. It seems to be located in a high up, wooded area , so could be anywhere from South America to Europe.
Grand Valley: I'm thinking a mediterranean location. Nice weather. Big Mountains.
SSR5/CSR5: Seems to be American Road Signs. I think LA or somewhere.
Driving Park: Could be anywhere.
Eigen Loop (hidden): Eigen. Eiger. Pretty similar, aren't they? Perhaps the canned Eigen Loop was an early development of Eiger Nordwand? Just a thought.
Plam/Palm Strip (hidden): A strip with palm trees? Two words: Los. Angeles. As for the Palm/Plam debate, I reckon it's
actually meant to be
Palm but the fact that it says Plam in the opening movie is just another of GT2's noomerus spelin mistacs.
